[backport 2.3.x] TST (string dtype): update all tests in tests/frame/indexing (pandas-dev#60193) (pandas-dev#60212)

* TST (string dtype): update all tests in tests/frame/indexing (pandas-dev#60193)

(cherry picked from commit bec2dbc)

* update for 2.3.x

Author: jorisvandenbossche

pandas/tests/frame/indexing/test_coercion.py

@@ -7,8 +7,6 @@
 import numpy as np
 import pytest
 
-from pandas._config import using_string_dtype
-
 import pandas as pd
 from pandas import (
     DataFrame,
@@ -99,28 +97,42 @@ def test_6942(indexer_al):
     assert df.iloc[0, 0] == t2
 
 
-@pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
 def test_26395(indexer_al):
     # .at case fixed by GH#45121 (best guess)
     df = DataFrame(index=["A", "B", "C"])
     df["D"] = 0
 
     indexer_al(df)["C", "D"] = 2
-    expected = DataFrame({"D": [0, 0, 2]}, index=["A", "B", "C"], dtype=np.int64)
+    expected = DataFrame(
+        {"D": [0, 0, 2]},
+        index=["A", "B", "C"],
+        columns=pd.Index(["D"], dtype=object),
+        dtype=np.int64,
+    )
     tm.assert_frame_equal(df, expected)
 
     with tm.assert_produces_warning(
         FutureWarning, match="Setting an item of incompatible dtype"
     ):
         indexer_al(df)["C", "D"] = 44.5
-    expected = DataFrame({"D": [0, 0, 44.5]}, index=["A", "B", "C"], dtype=np.float64)
+    expected = DataFrame(
+        {"D": [0, 0, 44.5]},
+        index=["A", "B", "C"],
+        columns=pd.Index(["D"], dtype=object),
+        dtype=np.float64,
+    )
     tm.assert_frame_equal(df, expected)
 
     with tm.assert_produces_warning(
         FutureWarning, match="Setting an item of incompatible dtype"
     ):
         indexer_al(df)["C", "D"] = "hello"
-    expected = DataFrame({"D": [0, 0, "hello"]}, index=["A", "B", "C"], dtype=object)
+    expected = DataFrame(
+        {"D": [0, 0, "hello"]},
+        index=["A", "B", "C"],
+        columns=pd.Index(["D"], dtype=object),
+        dtype=object,
+    )
     tm.assert_frame_equal(df, expected)
 
 

pandas/tests/frame/indexing/test_indexing.py

@@ -12,7 +12,6 @@
 from pandas._config import using_string_dtype
 
 from pandas._libs import iNaT
-from pandas.compat import HAS_PYARROW
 from pandas.errors import (
     InvalidIndexError,
     PerformanceWarning,
@@ -518,18 +517,17 @@ def test_setitem_ambig(self, using_infer_string):
         else:
             assert dm[2].dtype == np.object_
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)", strict=False)
-    def test_setitem_None(self, float_frame, using_infer_string):
+    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
+    def test_setitem_None(self, float_frame):
         # GH #766
         float_frame[None] = float_frame["A"]
-        key = None if not using_infer_string else np.nan
         tm.assert_series_equal(
             float_frame.iloc[:, -1], float_frame["A"], check_names=False
         )
         tm.assert_series_equal(
-            float_frame.loc[:, key], float_frame["A"], check_names=False
+            float_frame.loc[:, None], float_frame["A"], check_names=False
         )
-        tm.assert_series_equal(float_frame[key], float_frame["A"], check_names=False)
+        tm.assert_series_equal(float_frame[None], float_frame["A"], check_names=False)
 
     def test_loc_setitem_boolean_mask_allfalse(self):
         # GH 9596
@@ -1191,7 +1189,6 @@ def test_setitem_with_unaligned_tz_aware_datetime_column(self):
         df.loc[[0, 1, 2], "dates"] = column[[1, 0, 2]]
         tm.assert_series_equal(df["dates"], column)
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_loc_setitem_datetimelike_with_inference(self):
         # GH 7592
         # assignment of timedeltas with NaT
@@ -1210,13 +1207,10 @@ def test_loc_setitem_datetimelike_with_inference(self):
         result = df.dtypes
         expected = Series(
             [np.dtype("timedelta64[ns]")] * 6 + [np.dtype("datetime64[ns]")] * 2,
-            index=list("ABCDEFGH"),
+            index=Index(list("ABCDEFGH"), dtype=object),
         )
         tm.assert_series_equal(result, expected)
 
-    @pytest.mark.xfail(
-        using_string_dtype() and HAS_PYARROW, reason="TODO(infer_string)"
-    )
     def test_getitem_boolean_indexing_mixed(self):
         df = DataFrame(
             {
@@ -1258,7 +1252,7 @@ def test_getitem_boolean_indexing_mixed(self):
         tm.assert_frame_equal(df2, expected)
 
         df["foo"] = "test"
-        msg = "not supported between instances|unorderable types"
+        msg = "not supported between instances|unorderable types|Invalid comparison"
 
         with pytest.raises(TypeError, match=msg):
             df[df > 0.3] = 1

pandas/tests/frame/indexing/test_insert.py

@@ -6,8 +6,6 @@
 import numpy as np
 import pytest
 
-from pandas._config import using_string_dtype
-
 from pandas.errors import PerformanceWarning
 
 from pandas import (
@@ -62,15 +60,15 @@ def test_insert_column_bug_4032(self):
         expected = DataFrame([[1.3, 1, 1.1], [2.3, 2, 2.2]], columns=["c", "a", "b"])
         tm.assert_frame_equal(result, expected)
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_insert_with_columns_dups(self):
         # GH#14291
         df = DataFrame()
         df.insert(0, "A", ["g", "h", "i"], allow_duplicates=True)
         df.insert(0, "A", ["d", "e", "f"], allow_duplicates=True)
         df.insert(0, "A", ["a", "b", "c"], allow_duplicates=True)
         exp = DataFrame(
-            [["a", "d", "g"], ["b", "e", "h"], ["c", "f", "i"]], columns=["A", "A", "A"]
+            [["a", "d", "g"], ["b", "e", "h"], ["c", "f", "i"]],
+            columns=Index(["A", "A", "A"], dtype=object),
         )
         tm.assert_frame_equal(df, exp)
 

pandas/tests/frame/indexing/test_setitem.py

@@ -3,8 +3,6 @@
 import numpy as np
 import pytest
 
-from pandas._config import using_string_dtype
-
 import pandas.util._test_decorators as td
 
 from pandas.core.dtypes.base import _registry as ea_registry
@@ -148,13 +146,16 @@ def test_setitem_different_dtype(self):
         )
         tm.assert_series_equal(result, expected)
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_setitem_empty_columns(self):
         # GH 13522
         df = DataFrame(index=["A", "B", "C"])
         df["X"] = df.index
         df["X"] = ["x", "y", "z"]
-        exp = DataFrame(data={"X": ["x", "y", "z"]}, index=["A", "B", "C"])
+        exp = DataFrame(
+            data={"X": ["x", "y", "z"]},
+            index=["A", "B", "C"],
+            columns=Index(["X"], dtype=object),
+        )
         tm.assert_frame_equal(df, exp)
 
     def test_setitem_dt64_index_empty_columns(self):
@@ -164,14 +165,15 @@ def test_setitem_dt64_index_empty_columns(self):
         df["A"] = rng
         assert df["A"].dtype == np.dtype("M8[ns]")
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_setitem_timestamp_empty_columns(self):
         # GH#19843
         df = DataFrame(index=range(3))
         df["now"] = Timestamp("20130101", tz="UTC").as_unit("ns")
 
         expected = DataFrame(
-            [[Timestamp("20130101", tz="UTC")]] * 3, index=[0, 1, 2], columns=["now"]
+            [[Timestamp("20130101", tz="UTC")]] * 3,
+            index=range(3),
+            columns=Index(["now"], dtype=object),
         )
         tm.assert_frame_equal(df, expected)
 
@@ -204,14 +206,13 @@ def test_setitem_with_unaligned_sparse_value(self):
         expected = Series(SparseArray([1, 0, 0]), name="new_column")
         tm.assert_series_equal(df["new_column"], expected)
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_setitem_period_preserves_dtype(self):
         # GH: 26861
         data = [Period("2003-12", "D")]
         result = DataFrame([])
         result["a"] = data
 
-        expected = DataFrame({"a": data})
+        expected = DataFrame({"a": data}, columns=Index(["a"], dtype=object))
 
         tm.assert_frame_equal(result, expected)
 
@@ -677,11 +678,10 @@ def test_setitem_iloc_two_dimensional_generator(self):
         expected = DataFrame({"a": [1, 2, 3], "b": [4, 1, 1]})
         tm.assert_frame_equal(df, expected)
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_setitem_dtypes_bytes_type_to_object(self):
         # GH 20734
         index = Series(name="id", dtype="S24")
-        df = DataFrame(index=index)
+        df = DataFrame(index=index, columns=Index([], dtype="str"))
         df["a"] = Series(name="a", index=index, dtype=np.uint32)
         df["b"] = Series(name="b", index=index, dtype="S64")
         df["c"] = Series(name="c", index=index, dtype="S64")
@@ -712,7 +712,6 @@ def test_setitem_ea_dtype_rhs_series(self):
 
     # TODO(ArrayManager) set column with 2d column array, see #44788
     @td.skip_array_manager_not_yet_implemented
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_setitem_npmatrix_2d(self):
         # GH#42376
         # for use-case df["x"] = sparse.random((10, 10)).mean(axis=1)
@@ -721,7 +720,7 @@ def test_setitem_npmatrix_2d(self):
         )
 
         a = np.ones((10, 1))
-        df = DataFrame(index=np.arange(10))
+        df = DataFrame(index=np.arange(10), columns=Index([], dtype="str"))
         df["np-array"] = a
 
         # Instantiation of `np.matrix` gives PendingDeprecationWarning
@@ -936,12 +935,11 @@ def test_setitem_with_expansion_categorical_dtype(self):
         ser.name = "E"
         tm.assert_series_equal(result2.sort_index(), ser.sort_index())
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_setitem_scalars_no_index(self):
         # GH#16823 / GH#17894
         df = DataFrame()
         df["foo"] = 1
-        expected = DataFrame(columns=["foo"]).astype(np.int64)
+        expected = DataFrame(columns=Index(["foo"], dtype=object)).astype(np.int64)
         tm.assert_frame_equal(df, expected)
 
     def test_setitem_newcol_tuple_key(self, float_frame):

pandas/tests/frame/indexing/test_where.py

@@ -46,7 +46,6 @@ def is_ok(s):
 
 
 class TestDataFrameIndexingWhere:
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)", strict=False)
     def test_where_get(self, where_frame, float_string_frame):
         def _check_get(df, cond, check_dtypes=True):
             other1 = _safe_add(df)
@@ -64,7 +63,10 @@ def _check_get(df, cond, check_dtypes=True):
         # check getting
         df = where_frame
         if df is float_string_frame:
-            msg = "'>' not supported between instances of 'str' and 'int'"
+            msg = (
+                "'>' not supported between instances of 'str' and 'int'"
+                "|Invalid comparison"
+            )
             with pytest.raises(TypeError, match=msg):
                 df > 0
             return
@@ -98,7 +100,6 @@ def test_where_upcasting(self):
         tm.assert_series_equal(result, expected)
 
     @pytest.mark.filterwarnings("ignore:Downcasting object dtype arrays:FutureWarning")
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)", strict=False)
     def test_where_alignment(self, where_frame, float_string_frame):
         # aligning
         def _check_align(df, cond, other, check_dtypes=True):
@@ -130,7 +131,10 @@ def _check_align(df, cond, other, check_dtypes=True):
 
         df = where_frame
         if df is float_string_frame:
-            msg = "'>' not supported between instances of 'str' and 'int'"
+            msg = (
+                "'>' not supported between instances of 'str' and 'int'"
+                "|Invalid comparison"
+            )
             with pytest.raises(TypeError, match=msg):
                 df > 0
             return
@@ -174,7 +178,6 @@ def test_where_invalid(self):
             df.mask(0)
 
     @pytest.mark.filterwarnings("ignore:Downcasting object dtype arrays:FutureWarning")
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)", strict=False)
     def test_where_set(self, where_frame, float_string_frame, mixed_int_frame):
         # where inplace
 
@@ -196,7 +199,10 @@ def _check_set(df, cond, check_dtypes=True):
 
         df = where_frame
         if df is float_string_frame:
-            msg = "'>' not supported between instances of 'str' and 'int'"
+            msg = (
+                "'>' not supported between instances of 'str' and 'int'"
+                "|Invalid comparison"
+            )
             with pytest.raises(TypeError, match=msg):
                 df > 0
             return

pandas/tests/frame/indexing/test_xs.py

@@ -3,8 +3,6 @@
 import numpy as np
 import pytest
 
-from pandas._config import using_string_dtype
-
 from pandas.errors import SettingWithCopyError
 
 from pandas import (
@@ -79,10 +77,9 @@ def test_xs(
         else:
             assert (expected == 5).all()
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_xs_corner(self):
         # pathological mixed-type reordering case
-        df = DataFrame(index=[0])
+        df = DataFrame(index=[0], columns=Index([], dtype="str"))
         df["A"] = 1.0
         df["B"] = "foo"
         df["C"] = 2.0